LRV Contrast Calculator — Stair Nosing Compliance Checker
Free compliance tool
UK building guidance (Approved Documents K & M, BS 8300) says a stair nosing should contrast visually with the step — a difference of at least 30 LRV points (Light Reflectance Value, 0 = black, 100 = white). Pick your floor and a nosing insert colour below to check instantly.
1. Your step / floor covering
Choose the closest match, pick a custom colour, or type the LRV from your flooring datasheet.
2. Nosing insert colour
Typical LRVs for our anti-slip insert colours. Always confirm the exact figure on the product datasheet before final specification.
Select a floor and an insert colour to see your result
Compliant insert colours for this floor
Shop DDA-compliant stair nosings →The rules in brief: Approved Document M and BS 8300-2 recommend the nosing contrasts with the tread and riser by ≥ 30 LRV points. Approved Document K advises the contrasting strip is 50–65 mm wide on the tread and 30–55 mm on the riser. Colour-picker LRVs are screen approximations (calculated from sRGB relative luminance) — for final specification always use measured LRVs from the flooring and nosing datasheets. Need help choosing? Call us on 01282 270 010 or request free samples.